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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e46ca1cff393054e5254de762bfe05e62ba0ee4fd744dc8f2e7ab879b6acd0' 
  AND token = 'IH+Rq4ZLr8y1t8UPNKZ1znspK0OGCESrIn5APv/50lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}